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(Nemeael.) 2 sheets-sheet 1. A. SGHLEE.

FLOUR SIFTING SIEVE.

Peten'eed Aeg. s, 1.893.

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(No Model.) 2 SheetsF-Sheet 2. A. SCHLEE. FLOUR SIPTING SIEVE.

Patented Aug. 8, 1891i UNITED STATES PATENT OFFICE.V

AUGUST SCHLEE, OF HAGENOW, GERMANY.

FLOUR-SIFTING SIEVE.

SPECIFICATION forming part of Letters Patent No. 502,764, dated August 8, 1893.

Application led January 5, 1893.

ATo all whom it may concern.-

Be it known that I, AUGUST SCHLEE, a sub- `Ject of the Emperor of Germany, residing at Hagenow, in the Grand Duchy of Mecklenburg, Germany, have invented certain new and useful Improvements in Flour-Sitting Sleves; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled 1n the art to which it appertains to make and use the same.

The invention consists in the disposition of .sifting surfaces on the sides of bolters as well as the regular bottom part, a shaking or a reciprocating swinging motion being imparted to the bolter. Besides the bottom and the lateral surfaces the ceiling also can be made a sifting surface, so that the bolter is formed of a complete bolting compartment, which offers over the ordinary bolting devices now in use, the advantage, that not only the bottom surface alone, but-also the sides are working,

.so that the particles of the material thrownv against these sides, are sifted here, and thus the devices, necessary in plane faced bolters for instance, to keep the material away from the sides, can be dispensed with. Moreover the sifting surfaces of my bolter are more elastic and more yielding than those of the bolters, having the bottom sifting surface firmly nailed on. Therefore the sifting surifaces are constantly making (on account of -[their yielding properties) small motions, `.which greatly'diminishes the choking up of lthe meshes, a disadvantage, occurring in the ordinary plane bolters, when very iioury matefrial is thrown in, so soon, that it becomes necessary to clean the sifting surfaces by using bnuslhes, dusters, or beaters, (Sac. This method of cleaning however very soon Wears out the sifting surfaces. rlhe present invention overcomes all these inconveniences by the pliable arrangement of the sifting compartf My device offers another advantage i, by dispensing with the many Wooden parti- `j ment.

tions of the frames, as they are now in use in ordinary plane-sitters; thereby the sieves become much lighter, which offers another great advantage, L'. e., an easier way of motion, and consequently an avoiding of strong concussions by the driving machinery.

Figure 1 shows a longitudinal section Serial No. 457,353. (No model.)

through two compartments of my sieve. Fig. 2 is a horizontal and Fig. 3 a vertical section of the same. Fig. 4 shows a method of securing and fastening the compartments. Figs. 5 and 6 show in longitudinal and verticalsection a sieve with gyrating movement; Fig. 7 showing the same with a shaking motion consisting of a simple backward and forward movement.

In the said drawings one of the possible forms of a plane sieve is shown, provided with two bolting compartments formed in aframe beside each other. In the framexA the two bolting sieves A and A2 are stretched being made of silk gauze or similar fabric, which at the four edges, formed by the bottom a, ceiling c and sides b b, is sewed together with two strips of linen f f (Fig. 4). These strips of linen are provided with metal eyes f', which receive a tightening wire c, by which the gauze isdrawn tight, and attached to the rods d, provided in the frame A (Figs. 2 and 3). Instead of this mode of tightening the gauze any other may be chosen, or it may be nailed to the parts of the frame. Openings B B are arranged at the ends of the compartments for the entrance of the material, and openings B B for its exit. It is obvious, that the material entering at B,duringa swinging or Shak.- ing motion of the bolting frame, and working its way down to the outlets B, will be sifted not only through the bottom a, but also through the sides 'b b and partly even through the ceiling c, so that a, b b, c, are sifting surfaces,

whereby the device obtains its maximum ofV The sieve with l the gyrating motion hangs by the suspending pulsion from a driving belt at s. By the rotation of the axle w, the hanging sieve is set in motion. The material to be sieved (meal for instance) is poured into the sieve-compartments A, A2, and passing through these compartments, the larger, coarser parts fall into the box r, and are taken out at the outlet a4, while the finer parts pass through the sievesurfaces and collect on the board or shelf a2 being taken out through the outlet a5. In Fig. 7 the sieve hangs also by the rods h, and has attached to its frame A a connecting rod 'n which works on the crank m, on the axle Z. The movement ot the axle Z gives a straight backward and forward motion to the sieve. The material to be sieved enters at a3, the coarser parts passing out at 7' and a", while the sieved material falls on the shelf or board and is taken away through fr" and a5. The arrangements with which the sifting material is moved forward or the forward movement is assisted on the above described journey through the sieving compartments are well known, and shall not therefore be here detailed. The sifting or sieving surfaces may consist of metal (wire sieve) or spun-thread netting or of silk gauze, the., according to the neness or coarseness of the grain of the material which is to be sifted.

I claimy In a bolter having a shaking or swinging motion, the compartments formed of sifting surfaces not only on the bottom, but also on the sides and ceiling and means for flexibly supportingsaid compartments to allow free vibration substantially as and for the purpose set forth.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

AUGUST SCHLEE.

Witnesses:

W. NoosBAcK, CHAs. H. BURKE. 

